Nested gimbal supports, in turn, can keep a telescope as large as 1500 pounds and 24 feet long on target in the midst of both balloon motion and occasional stratospheric wind gusts.
The hardware is put into a fiberglass pod, which hangs on either side of the choppers fuselage, on a gimbal, that lets it turn to cover the extra 60 degrees (for a total of 180 degrees of coverage each).